Adsorption of Alizarin Red Dye from Aqueous Solution on an Activated Charcoal

The activated charcoal was used for the removal of alizarin red dye from aqueous solution. Different parameters such as effect of contact time, initial dye concentration and pH were investigated. It was observed from the concentration study that the amount of dye adsorbed per unit mass of the adsorbent increased with increase in dye concentration. The pH study presented that the adsorption of dye on to activated charcoal was high at pH 2, which was decreased by further increase in pH. For the determination of mechanism of adsorption, pseudo-first order and pseudo-second order kinetic model were studies. It was found that the adsorption kinetic is best described by pseudo-second order equation. The experimental data was best filled to Langmuir isotherm which illustrated the adsorption of dye on the surface of charcoal was monolayer adsorption. The maximum sorption capacity was 8.97 mg/g.